Abstract: A method for determining a transponder type to which an electromagnetic transponder in the field of a terminal belongs, wherein the type is determined based on a difference between a measured value of a piece of information representative of the current in an oscillating circuit of the terminal and a no-load value of this piece of information.

Abstract: A method for configuring a first near-field communication device according to a modulation type transmitted by a second device, wherein: a decoder of the first device is configured to decode an overcoded type-B modulation; a signal received during a first time slot corresponding to the duration of a symbol of an initialization frame is decoded; and the first device is configured according to the value of the decoded symbol to determine the modulation type.

Abstract: A method for determining a transponder type to which an electromagnetic transponder in the field of a terminal belongs, wherein the type is determined based on a difference between a measured value of a piece of information representative of the current in an oscillating circuit of the terminal and a no-load value of this piece of information.

Abstract: A method of storage of digital data on a physical medium equipped with calculation circuitry, by ciphering the data using a symmetrical algorithm with a ciphering key independent from the recorder, and by transferring the ciphering key onto the medium or its calculation by an asymmetrical algorithm and a read method in which, on first reading from the physical medium, a user key is transferred to the calculation circuitry by an asymmetrical ciphering process, a ciphered key of the data ciphering key is calculated in the calculation circuitry of the medium and by a symmetrical algorithm with the user key, and the asymmetrical ciphering portion of the calculation circuitry are deactivated.

Abstract: A method for configuring a first near-field communication device according to a modulation type transmitted by a second device, wherein: a decoder of the first device is configured to decode a type-A modulation; a signal received during a first time slot corresponding to the duration of a first type-A symbol is decoded; and the first device is configured according to the value of the decoded symbol to determine the modulation type.

Abstract: A method and a system for sharing files recorded by non-divisible sections in a first memory, including dividing each section into subsets to which are respectively assigned specific access rights; storing, in a second memory, separate from the first one, a specification table comprising at least the location of each subset in the section, at least one key conditioning the access to this subset, and the rights assigned to the key; and conditioning the accesses to the subsets to their respective specifications by a control performed by a microprocessor.

Abstract: A method of storage of digital data on a physical medium equipped with calculation circuitry, by ciphering the data using a symmetrical algorithm with a ciphering key independent from the recorder, and by transferring the ciphering key onto the medium or its calculation by an asymmetrical algorithm and a read method in which, on first reading from the physical medium, a user key is transferred to the calculation circuitry by an asymmetrical ciphering process, a ciphered key of the data ciphering key is calculated in the calculation circuitry of the medium and by a symmetrical algorithm with the user key, and the asymmetrical ciphering portion of the calculation circuitry are deactivated.

Abstract: A method and a circuit for updating cyclic data files in sequential access storage elements, including storing, in at least one index file, itself cyclic, respective indexes of the data files and, in at least one index register, the current index of the index file.

Abstract: A method and a system for sharing files recorded by non-divisible sections in a first memory, including dividing each section into subsets to which are respectively assigned specific access rights; storing, in a second memory, separate from the first one, a specification table comprising at least the location of each subset in the section, at least one key conditioning the access to this subset, and the rights assigned to the key; and conditioning the accesses to the subsets to their respective specifications by a control performed by a microprocessor.

Abstract: A prior introduction into the memory of a document in a non-validated state, to be acquired by validation, and a function of acquiring the document, independent of the electronic purse function. When it is wished to acquire such a document, the sales terminal and the independent functions of acquisition and electronic payment of the card are put in communication. A document acquisition order is placed, transmitted to the acquisition function by the terminal. Verification of the presence in the card of the document to be validated and its authenticity and a verification of the presence and authenticity of an amount in the purse for the acquisition of a document are organized. If the two verification steps are positive, a simultaneously sending of a global agreement signal to each of the functions is organized in order simultaneously on the one hand to validate the document as an acquired document and on the other hand to debit the purse by the amount of the acquisition.

Abstract: A prior introduction into the memory of a document in a non-validated state, to be acquired by validation, and a function of acquiring the document, independent of the electronic purse function. When it is wished to acquire such a document, the sales terminal and the independent functions of acquisition and electronic payment means of the card are put in communication. A document acquisition order is placed, transmitted to the acquisition function by means of the terminal. Verification of the presence in the card of the document to be validated and its authenticity and a verification of the presence and authenticity of an amount in the purse for the acquisition of a document are organised. If the two verification steps are positive, a simultaneously sending of a global agreement signal to each of the functions is organised in order simultaneously on the one hand to validate the document as an acquired document and on the other hand to debit the purse by the amount of the acquisition.